Since the iOS 4.3 is release, the unlock and jailbreak for iOS 4.3 will also release too. You can Download Ultrasn0w 1.3 & JailbreakMe 3.0 for iOS 4.3 Jailbreak & Unlock after their release.
The ultrasn0w 1.3 will for iPhone 4 baseband 2.10.04, 3.10.01, 04.08.00. So the ultrasn0w 1.3 will unlock iOS 4.2.1 & iOS 4.3 iPhone 4. The jailbreakMe 3.0 for iOS 4.3 untethered jailbreak by comex is also undergoing. Well, the iPhone Dev Team will release the ultrasn0w 1.3 only after the official release of iOS 4.3.
Well, about the jailbreakMe 3.0, comex is said to have a untethered jailbreak for iOS, and comex is also wait for the release of iOS 4.3 final. Let's check what on earth will the iPhone Dev Team will bring for untethered jailbreak and unlock iOS 4.3. Will it be the ultrasn0w 1.3 and jailbreakMe 3.0? Before the release, no body knows.